8BK80

Genuine metal-clad single busbar switchgear with

Vacuum Circuit Breaker on withdrawable truck upto 36kV

Fully Typed Testedincluding Internal Arc Test

Answers for infrastructure and cities.

s

www.siemens.co.in

Switching Device Compartment for Partners - Ivac36kV, 26.3kA, upto 1250A with 3AH03 Vacuum Circuit Breaker

Advantages of Vacuum over other interrupting media:

Highest dielectric strength over a small contact gap

Constant low contact resistance

Fastest recovery strength

Lowest arc energy dissipation

Lowest drive energy requirements

Minimum contact erosion

Least number of moving parts and hence highest reliability

Construction

consist of three poles incorporating the vacuum interrupters housed in insulated shell. These poles are then covered

completely enclosed. The moving contacts of the vacuum interrupter are connected to the drive mechanism through insulated connecting rods. Operating mechanism is of stored energy type and suitable for auto reclosing duty. The operation can be manual/electrical as desired. 3AH03

Salient features of 3AH03 Vacuum Circuit Breaker

Simple and compact design

Interrupters housed inside an enclosed insulated pole

Suitable for rapid auto reclosing

Highly reliable operation

Long maintenance free life

High switching capability

Fully established for all applications

Matching drive and interrupter characteristics

Trolley mounted for the ease of handling

development

Fully type tested switchgear

Most compact design

Lower design cost

Maintenance free new generation interrupters from Siemens

Technical Data

Ivac with 3AH03 Vacuum Circuit Breaker

Rated Voltage

One minute power frequency withstand voltage (rms)

Rated current

Short Time Withstand current (3 sec)

Rated Operating sequence O-0.3sec-CO-3min-CO

400A

Guaranteed number of operations for vacuum interrupter at rated current 30,000

Guaranteed number of operations for drive mechanism

Yes

Type of operating mechanism Motor Spring Reserve Drive (M.S.R.D.)

Dimensions Height

Width

Depth

Switching application

in various industries, infrastructure projects and power utilities.

XX-XX-XXX-XXX

in this catalog is subject to change without prior notice. For the latest information, please get in touch with our Sales

Siemens Ltd.

Thane Belapur Road

www.siemens.com/medium-voltage-devices

Western Region

Mumbai

Vadodara

Pune

B Wing, Senapati Bapat Marg

Eastern Region

Kolkata43, Shantipalli E.M. Bypass, Rash Behari Connector

Northern Region

Gurgaon3rd Floor, Tower - B

Maruti Industrial Area, HUDA

Southern Region

Chennai9th Floor, Sigaphi Achi Building

For more information, please contact:

ROUTINE TEST CERTIFICATE

PRADIP POWERTECH PVT LTDClientN8 19767Sr. No.

3AH03142AEEAAKF2MLFB3003870404/200W. O. No.

VS 36025Interrupter Type36kV,26.3kA,1250AC. B. Rating Date

9.09Spring Charge Time1.27Current Input

11.00at Ua 0.851.13at Ua 0.85

110V DCClosing Solenoid 3AY1510YType

110V DCOpening Solenoid 3AY1510YType

N.A.Additional Release N.A.Type

67.4Closing Time45.5OpeningTime

4.3R

4.2Y

4.3B

70kVHV TEST ON MAIN CIRCUITS

OPERATES SATISFACTORILY AT 0.85 Ua AND 1.1 Ua

OPERATES SATISFACTORILY AT 0.70 Ua AND 1.1 Ua

mV DROP at 100 Amp

MECHANICAL OPERATING TESTS : CHECKED OK

HV TEST ON AUX. CIRCUITS 2 kV/min OKOK

THE EQUIPMENT COMPLIES WITH SPECIFICATIONS OF IEC 62271-100 AND IS 13118.COMPLIANCE WITH ABOVE SPECIFICATION HAS BEEN CHECKED BY ROUTINE TESTING INTEST LABORATORY

/min

Note:

Print Date:

Quality AssuranceENERGY DISTRIBUTION DIVISION THANE-BELAPUR ROADP. O. BOX 85, THANE(MAHARASHTRA) INDIA.

Sec.Amp.

Sec.Amp.

msecmsec

mV mV mV

::::

:::

17/06/2014

230V ACMotor Mechanism :::

14/06/2014

::

: :

:

:

:

:

::

:

PIN - 400 601.TEL - +91-22-2762 3975 FAX - +91-22-2762 3710.

::

OpeningTime : msec

Siemens Ltd.

ED-MV/Q

This is a computer generated document, hence do not require signature.

ROUTINE TEST CERTIFICATE

PRADIP POWERTECH PVT LTDClientN8 19768Sr. No.

3AH03142AEEAAKF2MLFB3003870404/200W. O. No.

VS 36025Interrupter Type36kV,26.3kA,1250AC. B. Rating Date

8.49Spring Charge Time1.31Current Input

10.52at Ua 0.851.17at Ua 0.85

110V DCClosing Solenoid 3AY1510YType

110V DCOpening Solenoid 3AY1510YType

N.A.Additional Release N.A.Type

66.5Closing Time43.1OpeningTime

4.5R

4.4Y

4.7B

70kVHV TEST ON MAIN CIRCUITS

OPERATES SATISFACTORILY AT 0.85 Ua AND 1.1 Ua

OPERATES SATISFACTORILY AT 0.70 Ua AND 1.1 Ua

mV DROP at 100 Amp

MECHANICAL OPERATING TESTS : CHECKED OK

HV TEST ON AUX. CIRCUITS 2 kV/min OKOK

THE EQUIPMENT COMPLIES WITH SPECIFICATIONS OF IEC 62271-100 AND IS 13118.COMPLIANCE WITH ABOVE SPECIFICATION HAS BEEN CHECKED BY ROUTINE TESTING INTEST LABORATORY

/min

Note:

Print Date:

Quality AssuranceENERGY DISTRIBUTION DIVISION THANE-BELAPUR ROADP. O. BOX 85, THANE(MAHARASHTRA) INDIA.

Sec.Amp.

Sec.Amp.

msecmsec

mV mV mV

::::

:::

17/06/2014

230V ACMotor Mechanism :::

06/06/2014

::

: :

:

:

:

:

::

:

PIN - 400 601.TEL - +91-22-2762 3975 FAX - +91-22-2762 3710.

::

OpeningTime : msec

Siemens Ltd.

ED-MV/Q

This is a computer generated document, hence do not require signature.

s

Installation, Operation and Maintenance Instructions

Air Insulated Switching Device Compartment Ivac - 36kV, 26.3kA, 1250AFor Indoor Applications on Withdrawable Circuit Breaker Truck with the system voltages 24kV & 36kV

2

Table of Contents

Page Nos

1. Technical Description

1.1 General 4

1.1.1 Application 4

1.2 Design Features 4

1.2.1 Circuit Breaker Compartment 4

1.2.1.1 Vacuum Circuit Breaker 4

1.2.1.2 Equipment 6

1.2.1.3 Motor Operating Mechanism (MI) 7

1.2.1.4 Closing Release (Y9) 3AY1510Y 7

1.2.1.5 Shunt Releases (Shunt opening releases) 7

1.2.1.6 Socket for low voltage plug connector 8

1.2.1.8 Mechanical interlock 3AX1520-2C 8

1.2.1.9 Service Position 9

1.2.1.10 Test Position 9

1.2.2 Accessories 10

1.2.3 Interlocks 10

1.3 Technical Data 10

1.3.1 Switching Device Compartment 10

1.3.2 Vacuum Circuit Breaker 10

2. Installation

2.1 Transport Units 12

2.2 Packing 12

2.4.1 Storage 12

2.5 Transferring the Transport Units 12

2.5.1 Removing the truck from the panel 12

2.6.1 Joining of the Panels 12

2.8.3 Protecting the panels against Environmental effects 14

2.10 Circuit breaker wiring 14

3. Putting the Switchgear into Service

3.1 Test Operations 17

3.1.1 With Door Open 17

Page Nos

4. Operations

4.1.2.1 Normal Operations 20

4.1.3.1 Normal Operations 20

4.1.4 Removing the LV Plug 21

4.1.5 Connecting the LV Plug 21

4.2 Circuit Breaker Operating Mechanism 21

4.3 Circuit Breaker Operation 21

4.4 Earthing 21

4.4.1 Earthing of Busbars / Cables with a Drawout Truck 21

4.4.1.1 Disconnection of Earthing Drawout Truck 21

4.5 Breaker Compartment Door 22

4.5.1 To Open the Door 22

4.5.2 To Close The Door 22

5. Maintenance

5.1 Switching Device Compartment 23

5.1.2 Cleaning 23

5.1.3 Lubrication 23

5.2 Vacuum Circuit Breaker 24

5.2.2 Servicing 25

6 Defecting door interlock of HV compartment

7. Disposal of Product 27

8 Summary of Important Instructions 28

9. Additional Information

9.1 Reference list of Items 29

3

DANGER!

that personal injuries can occur if the

taken

ATTENTlON!

measures are not taken.

NOTE!

operation or possible maloperation. Observe the notes.

Symbols used

operator to perform an operation.

General instructions

report applicable at the time of switchgear manufacture.

Five Safety Rules of Electrical Engineering

Due application

enclosure of live parts.

DANGER!

The perfect

instructions.

of the switchgear.

Observance of the instructions applicable

work.

Safety instructions

4

1. Technical Description

1.1 General

interlocks for safe operation of switchgear.

1.1.1 Application

applicable. Complete testing as per IEC 62271-200 is OEM

1.1.3 Ambient Temperature, Humidity and Installation Altitude:

Compartment is 1000m above mean sea level.

1.2 Design Features

1.2.1 Circuit Breaker Compartment

truck with Vacuum Circuit Breaker or Bus PT Truck. The

1.2.1.1 Vacuum Circuit Breaker

shown in Fig. 3b.

the vacuum circuit-breaker. Fig. 3c shows the arrangement of

Fig 1: Switching Device Compartment

5

Fig 2: 36kV breaker

3.1 Mechanical ‘ON’ Push Button

3.2 Mechanical ‘OFF’ Push Button

3.3 Spring Charging Opening

3.6 Mechanical Operations Counter

3.3

3.8

3.13.2

3.7

3.43.53.6

Fig 3a: Withdrawable truck with 3AH0 Vacuum Circuit Breaker Fig 3b: 3AH0 Vacuum Circuit Breaker

3.9 Mechanism housing

3.10 Vacuum Interrupter

3.12 Contact pressure spring

3.13 Top terminal

3.13

3.14

3.10

3.153.16

3.11

3.14 Tulip contact

3.15 Bottom terminal

3.16 Flexible current link

3.47 Detachable cover

3.48 Low voltage socket

3.12

3.47

3.9

3.48

number of ON-OFF charging operations. The rating plate

opening in the cover.

6

3.40 Movable contact

3.41 Moving contact stem

3.43 Metallic bellows

3.44 Ceramic

3.45 Fix contact

Fig 3d: Vacuum Interrupter

3.39

3.44

3.45

3.40

3.43

3.46

3.42

3.41

3.17 Gear box3.18 Motor3.19 Snap switch3.20 Rating plate

3.22 1st shunt release(Y1)3.23 2 shunt release(Y2)

3.26 Closing spring charging

3.29 Switching shaft3.30 Shock absorber3.31 Closing spring3.32 Opening spring3.33 Damping plate

3.37 Low voltage socket connector

3.9

3.20

3.313.17

3.19

3.26

3.28

3.27

3.18 3.30 3.33 3.32

3.29

3.34

3.223.21

3.38

3.37

Fig 3c: View of an open mechanism housing

Vacuum interrupters

The basic construction of the vacuum interrupters for the

(3.43) forms the vacuum-proof connection to the interrupter housing.

conform to the requirements of the

1.2.1.2 Equipment

– Electrical operating mechanism (charging motor) with electrical anti-pumping feature ........................ (M1)

– Closing release ......................................................... (Y9)

– 1st Shunt release ...................................................... (Y1)

......... (X0)

..................................... (S1)

– Position switch for signalling ......................................... (S41)

7

– Low voltage-64 terminal socket................................. (X0)

................... (S1)

..................................... (Y3)

..................................... (Y2)

3AX 1102 ................................................................. (Y4)

................................ (Y7)

– Mechanical interlock

1.2.1.3 Motor operating mechanism (M1)

The maximum DC power input is 770 W (approx.). The maximum AC power input is 900 VA (approx.). During part of the short spring charging time the motors operate in

DC 24 V DC 48 V DC 60 VDC/AC 110 V

DC 220 V/ AC 230 V

rating of protection 16 A 8A 6A 5A1) 2.5 A1)

Table 1: Rated currents of motor protection devices

1.2.1.4 Closing release (Y9) 3AY1510Y

Power consumption 200 W/VA

1.2.1.5 Shunt releases (shunt opening releases)

Basic 1st Shunt release (Y1) 3AY1510Y

Power consumption 200 W/VA

Supplementary 2nd Shunt release (Y3) 3AY15 10Y*)

shunt release. The voltage of this release hence can be

Power consumption 200W/VA

Supplementary 2nd Shunt release (Y2) 3AX1101*)

Power consumption =/< 60 W or =/< 47 VA

Supplementary Under voltage release (Y7) 3AX1103*)

takes place via an NC contact in the tripping circuit. But it can

CT-Operated release (Y4) 3AX1102*)

8

1.2.1.6 Socket for low-voltage plug connector (X0)

either 32-pins or 64-pins.

Note: Further wiring harness from Breaker to the low Voltage

manufacturer.

1.2.1.7 Auxiliary switch (S1) 3SV92

1.2.1.8 Mechanical interlocking 3AX1520-2C

The sensing parts of the substation check the switch

crank.

Release combinations

Basic Equipment

Closing release 3AY15 10

1st Opening release 3AY15

10release 3AY15

10release

3AX1101release

3AX1103release

3AX1102

MLFB No. at 9th position

Y9 Y1 Y3 Y2 Y7 Y4

1 1 A

1 1 1 E

1 1 1 B or W

1 1 1 1

1 1 1 1 D or X

1 1 1 F

1 1 1 1 G

1 1 1 C or Y

DC

Operational current I (A)

Operational current I (A)

up to 230 10

24 10 10

48 10 9

60 9 7

110 5 4

220 2.5 2

Table 2: Breaking capacity of 3SV92 aux. switch

9

1.2.1.9 Service Position (Connected Position)

plug connection.

1.2.1.10 Test Position

through low voltage plug connection. Also metallic shutters

contact.

1.2.1.11 Disconnected Position (Isolated Position)

1.2.1.12 Removed Position

using bolts.

the circuit breaker truck ensures the earthing of the truck in

mechanical counter4.3. LV connection plug4.4. Drive mechanism housing4.5. Truck (Drive Box)

Fig 4: Withdrawable Truck in Test Position & door open

4.7. Clip for locking LV plug to breaker

spring4.9. Opening for operating the breaker in service

position4.10. ‘ON’ push button4.11. ‘OFF’ push button

10

1.2.2 Accessories (refer Fig. 5)

1.2.3 Interlocks

page 7

State The following operations are not possible

– Removal of the

– Pulling of the LV plug

– Removal of the

– Pulling of the LV Plug

– Closing of the switching

– Pulling of the LV plug

– Transfer of the

service position

to service position.

1.3 Technical Data

1.3.1 Switching Device Compartment

r24/36 kV

Voltage U

w

50/70 kV

p 125/170 kV

sc26.3 kA

26.3 kA

65.75 kA

1250A

1.3.2 Vacuum Circuit Breaker

r24/36 kV

Voltage Uw

50/70 kV

Voltage Up

125/170 kV

3 secs26.3 kA

65.75 kA

65.75 kA

26.3 kA

800-1250 A

250 mm

Weight in 250 kg

Percentage of DC component

5.1

5.2

5.3

Fig 5: Accessories

11

1 Manufacturer

3 Serial number

5 Year of manufacture

Rating plate

Fig. 6:

breaking current

3 A H 0 3 1 4 2

Closing time = the interval of time between the initiation

touch in all poles.

Opening time = the interval of time between the initiation

separate in all poles.

Arcing time = the interval of time between the instant of the

in all poles.

Break time = the interval of time between the beginning

arcing time.

Close-open time = the interval of time (in a make-break

instant when the arcing contacts separate in all poles in the subsequent opening process.

Operating times

Closing time ....................................................................................................................................................... ms < 80Spring charging time ...................... (M1) .............................................................................................................. s < 15Opening time ................................. ......................................................... ms < 65

....................................... .......................... ms < 65 ....................................... ...................................

Arcing time ........................................................................................................................................................ ms < 15Break time ..................................... ......................................................... ms < 80Break time ..................................... .................................................... ms < 80

....................................... ................................... ms < 65

.......................................................................................................................................................... ms 300Close-open-time ............................. with shunt release 3AY15 10 (Y1) ................................................................ ms < 90Close-open-time ............................. .......................... ms < 90Close-open-time ............................. ................................... ms < 70Close-open-time ............................. with fast acting shunt release 3AY15 10 (Y1) ............................................... ms < 70

.......... ................................ with closing release 3AY15 10 (Y9) .............................................................. ms < 45.......... ................................ ......................................................... ms < 40.......... ................................ .................................................... ms < 40.......... ................................ ................................... ms < 20

.............................................................. ms > 15

......................................................... ms > 15

............................................................ ms > 10

1 s

2 4

Sr. No. 3 Year of manuf. 5

Ur 13 kV fr

10 Ir 6 A

Isc 12 kA t

k 7 s

Up 11 kV Ic A M 8 kg

IEC 62271-100

9

MADE IN INDIA

502-03-98200-001

8 Weight

breaking current

12

2. Installation

2.1 Transport Units

The panel should not be lifted from the top with circuit breaker inside.

2.2 Packing

2.3 Unloading

2.3.1 Handling equipment required

transport unit.

– Lifting tackle

– Pallet truck of 3 mtr length or two pallet trucks of smaller

2.3.2 Procedure

– Use of mobile crane..

the lifting tackle.

2.4 Examining the switchgear against damage

2.4.1 Storage

– The packing cases must be stored indoor such that

such natural elements

2.5 Transferring the transport units to their points of installation

clearance of about 25 mm between them.

2.5.1 Removing the Truck from the Panel

clause 4.1.3.1)

2.6 Assembling the Switchboard

2.6.2.

2.6.1 Joining of the Panels

13

2.6.2 Fixing the Switchboards to the Foundation

The panels bottom plate has four 30 mm x 30 mm cutouts

Welding

gaps.

Bolting Down

near the cutouts.

2.7 Earthing of the Switchboard

Connect the earth terminals of at least one or two panels

Device Compartment.

2.8 Other work to be carried out

2.8.1 Cleaning the Switchboard

Do not use any abrasive chemicals or detergents to clean installed parts.

2.8.2 Inserting the withdrawable truck

will go.

Locking the VCB before rack in (Fig. 9a).

cross channel.

– Tighten the top two bolts.

– Start rack in.

7.2 Upper metallic shutter 7.4 Thermostat 7.5 Space heater

Fig 7: View into Circuit Breaker panel after removing the drawout truck

7.1

7.4

7.2

7.3

7.5

8.4 Truck earthing strip

8.1

8.3

8.2

Fig 8: View into circuit breaker compartment with shutter held open

8.4

14

Unlocking VCB (Fig. 9a)

cross channel.

bottom of the panel as shown in the (Fig. 9b) on both

2.8.3 Protecting the panels against environmental effects

up with original paint.

installation.

2.9 Module Wiring

2.10 Circuit Breaker wiring

circuit breakers are shown in Fig. 10 to 13.

Fig 9a

Fig 9b

15

Function schematic diagram

M1 Motor operating mechanism

closing spring)

spring)X0 Socket of low-voltage plug connectorY1 1st Shunt release

Y9 Closing release

Fig. 10: 3AH0 VCB with electrical manual closing with 64-pin socket.

Fig. 11: Remaining contacts of aux. switch (6NO + 6NC)

16

Function schematic diagram

M1 Motor operating mechanism

closing spring)

spring)X0 Socket for low-voltage plug connectorY1 1st Shunt release

Y9 Closing release

Fig. 12: 3AH0 VCB with electrical manual closing with 64-pin socket.

Fig. 13: Extended aux. switch (12NO + 12NC)

17

3. Putting the switchgear into service

For details of operation refer section 4

Caution

(service) position ensure that it is in

- in the test position

Caution

- in the service position

Note: Complete Switch gear is in scope of the OEM

closing spring14.2 Door of circuit breaker compartment

– Number of operations (Operation Counter) – Closing spring of the circuit breaker

operating mechanism

14.3

14.2

14.4

14.7

14.8

14.5

14.6

14.1

Fig 14: Opening Elements

3.1 Test operations

3.1.1 With door open

– The motor operating mechanism start as soon as the LV – Operate the circuit breaker

18

s

BRIEF OPERATING INSTRUCTIONS FOR 8BK80 SWITCHGEAR

FOR DETAILED DESCRIPTION OF ABOVE OPERATIONS &SPRING CHARGING OF CB, OPENING/CLOSING OF DOOR, ETC.

REFER CLAUSE 4 OF THIS MANUAL

Fig 15: Label on door of breaker compartment

19

3.1.2 With door closed

position (see 4.1).

3.2 Checking the Accessory Items

all M8 bolts.

3.3 Space Heaters

the panels into service. The thermostat shall be set to cut

ambient temperature.

Heaters must always be kept “ON” in all the conditions (even during maintenance)

20

4. Operations

4.1 Withdrawable truck

4.1.1 Positions of the withdrawable truck

Service position(connected position)

Test position

Disconnected position

the LV socket from the plug.

control room.

4.1.2 Transferring the withdrawable part from the Test/Disconnected Position manually

4.1.2.1 Normal operation

1st Step

crank

from toas far it will

it offrom to

90° 90°

Fig 16a

4.1.3 Transferring the withdrawable part from the connected position to the test/disconnected position manually

4.1.3.1 Normal Operations

In brief

1st Step

crank

from toas far it will

it offrom to

90° 90°

Fig 16b

– Make sure that the circuit breaker is open.

4.1.3.2 Castell Key Operations

1st Step

from toas far it will

it offrom to

90° 90°

Fig 16c

– Make sure that the circuit breaker is open.

21

4.1.4 Removing the LV Plug

4.1.5 Connecting the LV Plug

4.2 Circuit-breaker operating mechanism

the closing spring after each switching operation. If the

4.3 Circuit-breaker Operation

4.3.1 Charging the closing spring by hand

Procedures

Operating Mechanism

– Pull the crank off.

4.3.1.1 Breaker ON and OFF

4.3.1.2 Mechanicallyto switch ON/OFF the VCB.

4.3.1.3 Electrically

4.3.2 Switching State Indication

4.4 Earthing

4.4.1 Earthing of Busbars or cables with a Drawout Truck (Fig. 32)

trucks.

Procedure

2.5.1)

2.8.2)

– Ensure that there is no voltage available on the parts to

clause 4.1.2).

4.4.1.1 Disconnection of Earthing Drawout truck

4.1.3)

– Disconnect the LV plug (refer clause 4.1.4)

22

– Connect the LV plug (refer clause 4.1.5)

– Remove warning plates.

4.5 Breaker Compartment Door

5.5 below.

4.5.1 To open the door

– Unscrew all M8 bolts

4.5.2 To close the door

– Tighten the bolt

17.1 Drawout truck

17.2 PT

17.3 Phase barrier

17.4 Shorting link

Fig 17: Drawout earthing truck

17.4

17.3

17.2

17.1

23

5. Maintenance

DangerPrecautions for Safe Working

service to test position.

Control terminals in the LV compartment must not be

5.1 Switching Device Compartment

5.1.1 Inspection Schedule

position.

connections.

joints.

Before removing the front plate of the breaker operating

the instructions given on the mechanism housing.

Service the switchgear at shorter intervals if the air is very moist or full of dust or is otherwise polluted.

5.1.2 Cleaning

CautionFor Safety

Cleaning Agents

into contact with them.

clean cloth.

5.1.3 Lubrication

with neutral grease.

make

temperature up to 150 C.

24

5.2 VCB

5.2.1 Maintenance schedule

Sequence No.

Work Materials Remarks

1. Circuit-Breaker

1.1 X X X –

1.2 Cleaning of cast resin components – Clean cloth X X X See note 1)

1.3surfaces as shown in Fig. 34.

See Fig. 24

Perform 3 to 5 test operations of ON/OFF. grease

– Shell Tellus 32 oil

X X Note 2Note 3

2. Breaker pole

2.1 Replace vacuum interrupters X

number (see rating plate)

3. Breaker operating mechanism Note 4

3.1 Replace motor M1 X X

3.2 Replace closing spring X

4. Examine and replace if necessary Note 5/Note 6

4.1 X X

4.2 X X

4.3 Leaking of shock-absorber X X

Fig. 18

Notes:

frequent intervals.

must not

anticorrosives.

Shell Tellus 32

Lubricants (for special requirement) are available from the

25

Fig. 19

a Lever for snap switch operation

b Bearing for lever

switch

switch

j Bearing for switching shaft

k Lever for switch-off block

I Lever on the switching shaft

m Damping plate

p Pin for opening spring

Shell Tellus 32 Oil

a cb

e

f

g

h

i

klmp

j

5.2.2 Servicing

GeneralDangerPrecautions for Safe Working

26

5.2.3 Troubleshooting of 3AH0 VCBs

Problem Symptoms / Effect Possible Causes / Reasons Remedial Measures

Breaker fails to close. close.

wiring.

19 or A2 of socket circuit.

5. Unoperational closing release.

6. Aux. switch (S1) contacts 21-22 are open when the breaker is with aux. switch.

7. Unoperational anti-pumping

wiring.

4. Unoperational charging motor.

operate

6. Mechanical failure of operating mechanism. centres.

Mechanical failure of operating mechanism. centres.

Nuisance or false closing of breaker

1. Electrical problemterminal 19 or A2.

2. Terminal A2 of closing release is wiring or release. Correct as per requirement.

2. Mechanical problem Mechanical failure of operating mechanism centres.

Breaker

trip.not trip.

2. There is no tripping wiring.

4 or C2 of socket. circuit.

5. Unoperational tripping release.

6. Aux. switch (S1) contacts 23-24 are open when the breaker is with aux. switch.

Nuisance or false tripping of breaker

1. Electrical problemterminal 4 or C2.

2. Mechanical problem 2. Mechanical failure of operating mechanism. centres.

27

6 Defeating the Door Interlock of HV Compartment

Caution: Take utmost care while defeating any interlock as the defeat operation leads to access to the areas / parts which are likely to be live.

6.1 Drawout Unit in Connected Position

– Switch off the circuit -breaker.

– Make sure that the busbars are not live.

4.6.1).

6.2 Drawout Unit in disconnected position

off.

6.3 Restoring the Door Interlocks

– Assemble the interlocking piece using two M4 screws.

7 Disposal of Product

wires.

materials or gases.

contractors.

28

8 Summary of Important Instructions

DOs

During Installation & Commissioning Stages:

torque on the bolts.

substation.

During service life of the panel-

etc.

before starting the maintenance or cleaning of the panels.

– operating mechanism parts such as plungers of

– functioning of space heaters.

the breaker.

(11) Check insulation resistance with a megger before putting the breaker back into service.

(12) Keep a log-book for each panel.

(13) Follow instructions given in the operating manual.

DON’Ts

these instructions.

(5) Do not lift the panel from the top with breaker